Loading markets...

He told the Sunderland Echo: "Until a player signs, I would prefer not to say too much about them.

"But what do I know about Mavrias? I know him, I know that he is a very good prospect, I know that he's a very exciting player.

"But I don't want to talk about him, or any more about what was said about (Stephane) Sessegnon at the weekend because things you say about transfers can easily cause problems and confusion, so I would prefer to wait and see."

Despite his youth, Mavrias made 70 domestic and European appearances for Panathinaikos, scoring six goals.

Aside from his two full international appearances, he has also been capped at Under-17, Under-19 and Under-21 level.